Regulating apparatus for mixing-valves.



c. ASBM'ANEYE. REGULATING APPARATUS FUR MIXIKG V A L307.

APPLICATION FILED N01. 20,

Patented June 21, 1910 inventor Witnesses:

U TE

STATES AE.

FFG

REG-ULATIN'G- APPARATUS FOR MIXING-VALVES.

Specification of Letters Patent.

Patented June 21, 1910.

Application filed November 29, 1907. Serial No. 404,391.

To all whom it may concern:

Be it known that I, CARL ASSMANN, a subject of the King of Prussia,residing at No. 183 Uhland street, Charlottenburg, in Germany, haveinvented a new and useful Improvement in Regulating Apparatus forMixing-Valves, of which the fol owlng 1s a specification.

This invention relates to mixing-valves which are largely used inchemical laboratories or work and in bath installations, particularly inshower-baths, for the purpose of mixing cold and hot water, and theobject of the invention is to overcome the drawback existing in suchappliances which consists in a simultaneous change of the ratio orrelative quantities of the liquids to be mixed and consequently of thetemperature of the mixture in accordance with the variation of thepressure conditions in the supply conduits of pipes, although theposition of the valve remains unaltered. With the usual method ofcarryin out bath installations, however, considera le fluctuations inpressure are unavoidable. This defect is obviated by inserting anautomatic-regulating device in the conduits before the mixing valve, andby so arranging the said regulator and combining it with the mixingvalve that it acts on the liquids in such a manner that both liquidsenter the mixing valve with equal pressure, the higher ressure of theone liquid bein automaticaily reduced to that of the other%iquid, beforeadmission to the mixing valve. For this operation the proportion of themixed liquids will remain constant so long as the respective position ofthe mixing va ve is maintained, independently of whatever may be changesof pressure in the supply conduits. This object is attained by means ofa regulating appliance attached or connected to the mixing valve on theinlet side, which regulator automatically throttles the liquid at higherpressure for the time being, thus reduclng its pressure to that of theother liquid at lower pressure, the higher pressure displacing adistributing slide of the re ulating device in aconvenient direction orpartially shutting ofi the respective passage.

Two constructional forms of the regulating device according to thisinvention are of Fig. 1, representing the regulating device. Fig. 3 is alongitudinal sectional elevation of another form of the regulatingdevice combined with a mixing valve.

Similar reference characters denote similar or equivalent partsthroughout the several views of the drawing.

Referring to Figs. 1 and 2, a and b designate the inlet-ports oradmission tubes for the two liquids to be mixed and having differenttemperatures. In the widened cylindrical portion e of the barrel orcasing of the regulating device, a piston f is axially displaceable,which piston .isintegral with or connected to two plungers or cylindricslides g and h on its two sides respectively, the said slides beinglongitudinally movable in corresponding bores or openings of twoextensions of the barrel which .are closed at either end in any suitablemanner. Springs z' and 7c maintain the piston in its middle position aslong as no other orces are oper-. ating on the same, and tend toreconduct the displaced piston to the said position. The one end 0 thecylinder 6, on its left hand side, is in open communication with theoutlet pipe'c b means of a by-pass Z, while its opposlte en communicatesin the same manner with the outlet pipe 01 through the channel m. In theslides g and h are provided slots or (passages n and 0 respectively,enabling the o n connection between the ports a and 0, an l; and (13respectively. To the .admisslon pipes a and b the conduits 0onveying thehot and cold water to the regulating device, are attached in the usualway, while the discharge pipes o and d are to be joined to therespective inlet ports of a mixing valve of any convenient or well knownconstruction.

The regulatin lows: Suppose tfie liquid pressures were uniform in eitherconduit. The distributing slide fig, it remains in repose when themixing valve is started. However, if the pres sure is higher orincreases in one of the conduits, for example, on the left hand side,the excess of pressure acts upon the left side of the iston 7 throughthe by-pass Z, thereby disp acing the entire distributing slide to theright hand, so that the edge 0 of the slot n comes in front of, andpartially closes the passage from the admission ort a to thedischargeport 0, thus producing throttling of the liquid flowing through the saidpassage, and gradually reducing the presappliance operates as folsure ofthe same to the amount of ressure prcsenton the other side, when thedistributin slide will come to rest.

'n the device represented in Fig. 3 the mixing device is arranged in thebarrel of the regulator; it may be a three way cock 8,

as shown, which allows to vary the exhaust of the hot and cold waterthrough the dis-, charge pipe w, mixed in any desired proportion. Twopistons 1' and g rigidly connected with one another by the distributingslide 25, move in separate cylinders e and 6 respectively. The passagesfrom the inlet ports 11 and u to the mixing valve 8 are controlled byslots at and 0 respectively, formed in the slide it on convenientplaces. This construction operates in the same manner as described abovein connection with Figs. 1 and 2, with the difference however that thehot and cold liquids act upon the ends of the distributing slide g, t,9" through the bypasses Z and m respectively.

Instead of the piston or pistons above referred to, a flexible diaphragmor diaphragms may be employed, as may be easily understood and is wellknown in the art, so that illustration may be dispensed with.

The springs 71 and 7c are not indispensable in all constructions, theirmain object being ti) cushion the movement of the distributing side.

,Iiiave shown several constructions of my iiivention for the purpose ofexamples, but it is obvious that the dis osition of the parts may bemodified in difi erent ways without departing from the principle of myinvention. I, therefore, do not wish to be limited to thoseconstructions, but

What I broadly claim as my invention, and desire to secure by LettersPatent, is

1. .A regulating device for liquid-mixing valves, comprising a casinghaving passages for two liquids, means for automatically restrictingeither passage without afl'ecting the other passage, and means wherebythe fluidpressures in said passages are exerted oppositely on the saidrestricted means for the passages.

2. A regulatingdevice for liquid mixing valves, comprising a casinghaving two liquid passages, and common controlling means for saidassages movable in opposite directions and adapted to automaticallyrestrict either passage under the actuating influence of an excess ofpressure in either passage, the restriction of one passage beingaccomplished without afi'ectin the other passage, and the arrangementicing such that I the fluid pressures in said passages act oppositelyupon said controlling means.

3. A regulating device for liquid-mixing valves, comprising a casinghaving two liquid-passages, each passage having an inlet branch and anoutlet branch, and a lunger rod intersecting the inlet an outletbranches and adapted to control the flow of liquid through each passage,the restriction of the flow through one passage being accomplishedwithout afiecting the flow throu h the other passage, and means where ythe fluid-pressures in said passages act oppositely on said plunger-rodand form the actuatin means therefor.

4. A regu ating device for liquid-mixing valves, comprising a casinghaving two liquid passages, each passage having an inlet branch and anoutlet branch, and a plungerrod chamber with which the inlet and outletbranches connect, a plunger-rod mounted to move in said chamber andadapted to restrict the openings of the inlet and outlet branches intothe plunger-rod chamber, and means whereby the fluid pressures in saidpassages operate oppositely on said plunger rod and form the actuatingmeans'therefor.

5. The combination with a mixing valve of a regulating valve, comprisinga cylinder, a iston movable therein, a distributing sli e connected withthe said pistonand rovided with slots, the cylinder being provided withseparate inletand discharge-ports for the liquids to be mixed, theassages from the inlet to the outlet ports being controlled by thevslide and the slots therein, and channels connecting. the said passageswith the ends of the cylinder.

6. The combination with a mixing valve of a regulatin device, comprisinga barrel, two passages firmed therein, a distributing slide movable inthe barrel by the pressure of the liquids flowing through said passages,operating faces provided on the slide on which the liquids to be mixedare adapted to act in opposite directions, the slide having slots andthe slide and slots being adapted to control the said passages.

7. The combination with a valve capable of mixinfg'two liquids atdifferent temperatures, o a regulatin device, comprising a. barrel,'twopassages or the 'hquids, formed therein, a distributing slide movable inthe barrel and adapted to control the said passages, and operating facesprovided on the slide and arranged in such a manner that they areadapted to receive the pressures of the liquids in opposite directions,said slide changing the pressure of one liquid without affecting that ofthe other.

8. The combination with a valve for mixing two liquids at differenttemperatures, of a regulatin device, comprising a casing, two passagesormed therein, a distributing slide movable in the casing and capable ofcontrolling the said passages, operating faces provided on the saidslide for receiving the pressures of the liquids in opposite directions,and by-passes for conveyin the liquid pressures to the said operatingowes to control the position of the slide. j

9. The combination with a valve for mixtwo liquids at differenttemperatures, of a regulating device, comprising a casing, two passagesformed therein, a distributing slide movable in the casing and capableof controlling the said passages, operating faces provided on the slideand receiving the pressures of the liquids in opposite directions,by-passes for conveying the liquid pressures to the said operating facesto control the position of the slide, and a ielding device capable ofreturning the slide to its normal position.

10. A regulating device for liquid valves, comprising a casing havingtwo separate liquid passages, and a plungerrod intersecting the passagesintermediate their inlet and ing outlet orifices and adapted toestablish and I control the flow of fluid through the inlet and outletortions of each passage, the plunger-rod eing subjected to the pressurein each passage and the preponderatin'g pressure moving the piston torestrict the corresponding passage.

11. A regulating device for liquids comprising a casing having twoseparate fluidpassages each composed of an inlet branch and an outletbranch, a plunger-rod control ling both passages and subjected to thepressures therein, the plunger-rod establishing and controllingcommunication between an inlet branch and the corresponding outletbranch, said plunger-rod being given its passage-controlling movement bythe difference of pressures of the fluids.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' CARL ASSMANN.

